# Quantum Kinetics of Fast-Electron Inelastic Collisions in Partially-Ionized Plasmas

Source: [Quantum Kinetics of Fast-Electron Inelastic Collisions in Partially-Ionized Plasmas](<https://www.sota2.com/research/paper/69bcd49f0636e5bf4afc2abb>)

Collection index: [llms.txt](<https://www.sota2.com/research/llms.txt>)

Data updated: 2026-03-21T05:00:04.296Z

Authors: Yeongsun Lee, Pavel Aleynikov, Jong-Kyu Park

Published: 2026-03-19T10:13:38.000Z

## Abstract

Fast electrons in partially ionized plasmas lose energy through inelastic collisions with bound electrons. While the mean energy loss is well described by stopping-power theory, fluctuations associated with discrete excitation and ionization events produce energy straggling and an additional longitudinal diffusion in momentum space. We incorporate this effect into fast-electron kinetics through a derived Fokker-Planck operator whose coefficients are obtained from ab initio quantum many-body simulations. We demonstrate that neglecting inelastic energy diffusion in partially ionized D-Ar plasmas can underestimate primary runaway-electron generation by several orders of magnitude.

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## Original sources and implementation

[Original paper](<https://arxiv.org/abs/2603.18715>)

[PDF](<https://arxiv.org/pdf/2603.18715.pdf>)